#include<stdio.h>
int main()
{
	int a = 10;
	int b = 20;
	int *p = &a;
	int **pp = &p;
	//*pp = &b;
	printf("%d\n", *p);
	printf("%p\n", p);
	printf("%d\n", **pp);
	printf("%p\n", pp);


	return 0;
}